một dung dịch X có chứa các ion ; Na⁺;Ba²⁺;Ca²⁺;Mg²⁺;H⁺;Cl⁻. Muốn tách được nhiều cationra khỏi dung dịch mà không đưa thêm ion lạ vào dung dịch , ta có thể dùng dung dịch X tác dụng với những chất nào sau đây ?

20 pts ‼️ an unmanned spacecraft travels to mars. mars has a lower strength of gravity than earth. where in the image is the spacecraft’s weight the greatest?

Which of the following is a chemical property of water at 4 c

Imagine you are a business executive who wants to pursue an environment policy for your company that limits pollution and uses fewer raw materials but would cost more what might be the discussion to your next broad meeting how would you make your case to your shareholders